Method and system with battery parameter estimation for rest period

A system for estimating a battery parameter for a rest period, the system comprising:

• one or more processors;
• memory storing instructions configured to, when executed by the one or more processors, cause the one or more processors to:
• determine whether an intercalation flux condition of a battery is satisfied;
• based on the determining, calculate an open circuit voltage (OCV) of the battery based on an initial voltage of the battery, a first time constant corresponding to a positive electrode of the battery, a second time constant corresponding to a negative electrode of the battery, a first constant, a second constant, and a value of a time variable;
• estimate a battery parameter based on the calculated OCV;
• and
• control charging and discharging of the battery based on a result of the estimating.

A processor-implemented method of determining an open circuit voltage (OCV) of a battery having a positive electrode and a negative electrode, the method comprising:

• based on determining that an intercalation flux condition of the battery is met in association with a rest period of the battery:
• determining an initial voltage of the rest period;
• determining a positive electrode component based on a state of charge (SOC) of the positive electrode or an open circuit potential of the positive electrode;
• determining a negative electrode component based on an SOC of the negative electrode or an open circuit potential of the negative electrode;
• determining the OCV of the battery based on the initial voltage, the positive electrode component, and the negative electrode component, wherein the determining the OCV comprises adding the initial voltage, the negative electrode component, and the positive electrode component;
• and
• controlling charging and discharging of the battery based on the determined OCV.